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(No Model.)

T. 1-". 'WITHBRBEE.

REGULATOR FOR BLOWING ENGINES. No. 257,799. Patented May 9,1882.

WITNESSES: Z N NEIVENTOR: @4 2, W/Qd, @MWL/ 57500. 7 V BY ATTORNEYS.

UNITED STATES PATENT OFFICE.

THOMAS F. WITHERBEE, OF PORT HENRY, NEW YORK.

REGULATOR FOR BLOWING-ENGINES.

SPEGIFICATION forming part of Letters Patent No. 257,799, dated May 9, 1882,

Application filed February 8,1882. (No model.)

To all whom it may concern: Be it known that I, THoMAs F.W1THERBEE, of Port Henry, Essex'county, New York, have invented a new and useful Improvement in Regulators for Blowing-Engines, of which the following is a full, clear, and exact description. The object of my invention is to govern the revolutions of blast-furnace blowing-engines so as to maintain a givennumber of revolutions, and consequently the supply of a given volume of air, regardless of the steam-pressure and the resistance to the air. To that end my invention consists in a regulator which combines a pressure-cylinder with a speed-governor, as hereinafterdescribed and claimed.

Reference is to be had to the accompanyin g drawing, forming part of this specification, wherein the regulator is shown by a vertical section.

A represents the rod of a centrifugal or other type of speed-governor, on which rodweights B are applied. The weights are to be so proportioned as to represent any given number of revolutions or part of a revolution. The governor will be madeto act, as usual, upon a valve-in the steam-pipe for controlling the supply of steam to the engine.

C is an air-cylinder having a connection, a, to the blast-pipe, or otherwise, so that the pressure in the cylinder shall correspond to that in the blast-pipe, and D is a piston on rod A, working in the cylinder. The cylinder is to be proportioned as required to vary the load on the governor-rod according to the variation in resistance of the furnace and the consequent variation in air-pressure. With a nearly-uniformhsteam-pressure this air-cylinder and piston would be sufficient to regulate the blast. and keep up the volume of air independently of the resistance but to prevent irregularities from variations in steam-pressure I provide the steam-cylinder E, having a connection, I),

'to the steamg-enerator, and the rod A has a piston, F, working in the steam-cylinder. The

steam and the air cylinder will be of properrelative proportion. Pressure in the steam-' cylinder works in opposition to the pressure in the air-cylinder or to decrease the load on the governor, so that the resultantof the two forces is communicated to the governor.

In operation the weights are applied to the governor to correspond with the desired number of revolutions, and a state of equilibrium would thus be established between the blast and steam pressure and the weight of the governor-balls. Supposing the steam-pressure to remain constant and the blast-pressure to increase, the pressure on piston D would add weight to the governor, thereby causing the admission of more steam to the engine and keeping up the revolutions. If, on the other hand, the steam-pressure increases, it would raise piston'F,th ereby relieving the governor and allow it to shut off steam to the extent required for keeping down the revolutions. It

will'be seen that in either case the volume of air will be kept uniform independent of steam and blast pressure, and the volume of air being the importantfactor in the management of blast-furnaces, my regulator secures successful re'sults.

To prevent possible neglector mismanagement of engineers, I provide for locking the weights. The support is provided with a rod, d, passing through the weights, and a lock, e, fitted on the end of the rod; or the weights may be inclosed in a box, and the box locked and the key kept only in the hands of the responsible person.

It will be understood that my regulator secures uniform speed under varying blast and steam pressure, as distinguished from ordinary governors, which vary the speed or pressure according to load.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- A blast-furnace blowing-engine having an air-cylinder,(l, connecting with the blast-pipe, a steam-cylinder, E, having piston F, and a speed-governor having the rod and piston A D working in the cylinder G,whereby a given volume of air may be maintained regardless of the steam-pressure and the air-resistance, as described.

rnoius FRASOIS wnmrnrnr.

Witnesses ARTEMAS B. WALDO, BENJAMIN F. BEERS. 

